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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Grating coupler integrated photodiodes for plasmon resonance based sensing.

Burak Turker1, Hasan Guner, Sencer Ayas

  • 1UNAM, Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, 06800, Turkey. bturker@aku.edu.tr

Lab on a Chip
|October 30, 2010
PubMed
Summary

This study presents an integrated plasmon resonance sensor for refractive index (RI) detection. The novel design offers high sensitivity and a simplified fabrication process for advanced biosensing applications.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Integrated Optics

Background:

  • Refractive index (RI) sensing is crucial for biochemical analysis.
  • Existing sensors often face challenges in sensitivity, fabrication, and integration.
  • Plasmon resonance offers a highly sensitive detection mechanism.

Purpose of the Study:

  • To demonstrate an integrated sensor combining grating-coupled plasmon resonance with a planar photodiode.
  • To utilize plasmon-enhanced light transmission for sensitive RI sensing.
  • To achieve a high areal density of sensing spots with an easy-to-fabricate design.

Main Methods:

  • Fabrication of an integrated sensor with a grating-coupled plasmon resonance surface and a planar photodiode.
  • Monitoring plasmon-enhanced light transmission by tuning the angle of incidence.

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  • Measuring photocurrent changes due to shifts in the resonance angle caused by RI variations.

    • Main Results:

    • Achieved an equivalent long-term RI noise of 6.3 × 10⁻⁶ RIU/√Hz.
    • Demonstrated good agreement between theoretical and experimental results.
    • Highlighted the potential for high areal density sensing spots due to the planar design.

    Conclusions:

    • The integrated plasmon resonance sensor provides a sensitive and robust platform for RI detection.
    • The design's simplicity and insensitivity to fabrication errors facilitate practical implementation.
    • Further enhancements in sensitivity are achievable through balanced detection and optimized plasmon coupling.